iOS 工程的警告修复
原文地址：http://www.cocoachina.com/ios/20170601/19396.html
在项目中碰到300+的警告，强迫症只能修复了
1:#warning这个后面添加中文的话，在xcode的左边警告列表页会显示不全，所以推荐使用英文注释
2:(Method possibly missing a [super awakeFromNib] call)这个处理，1:手动添加2:假如这个方法里面没有代码也可以删除这个方法
3:(Conflicting return type in implementation of 'supportedInterfaceOrientations': 'UIInterfaceOrientationMask' (aka 'enum UIInterfaceOrientationMask') vs 'NSUInteger' (aka 'unsigned long'))这个是重写系统的方法时把枚举类型的返回值写成了NSUInteger，返回值类型改回枚举就好。
4:(“View Controller“ is unreachable because it has no entry points, and no identifier for runtime access via -[UIStoryboard instantiateViewControllerWithIdentifier:].)这个警告是在一个xib中有多个storyboard其中有Storyboard ID为空的storyboard，找到删除。
5:(Automatic Preferred Max Layout Width before iOS 8.0)这个警告是因为xib中的label控件Preferred Width属性没有设置，勾选Explicit填上0就好。
6:(Frame for "Statuslabel" will be different at run time.)这个在xcode左边警告列表点击这个警告，会自动跳转到对应的xib，点击图上的按钮，然后Update Frames就好
7:(Prototype collection view cells must have reuse identifiers)这个是因为storyboard中拖入了collectionView，自带的collectionViewCell的reuse identifier为空，填入对应的reuse identifier就行
8:(warning: Attribute Unavailable: First baseline layout attribute before iOS 8.0)点击对应的警告跳转到xib界面在左边的filter中输入first，搜索出来的约束的firstItem和secondItem的constraint把两个都改为center.Y就好了
9:在podfile文件中 增加"inhibit_all_warnings!"这样pod的工程不会显示任何警告。
10:(PerformSelector may cause a leak because its selector is unknown)
加入这个宏：#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
11:('dismissModalViewControllerAnimated:' is deprecated: first deprecated in iOS 6.0)
加入这个宏：#pragma clang diagnostic ignored"-Wdeprecated"
12:(Comparison of constant 'NSStreamEventErrorOccurred' (8) with expression of type 'NSStreamStatus' (aka 'enum NSStreamStatus') is always false)
加入这个宏：#pragma clang diagnostic ignored"-Wtautological-compare"
13:(Null passed to a callee that requires a non-null argument)
加入这个宏：#pragma clang diagnostic ignored"-Wnonnull"
14:(Undeclared selector 'DWJQkeyboardWillShow:')
加入这个宏：#pragma clang diagnostic ignored"-Wundeclared-selector"
15:(Logical not is only applied to the left hand side of this comparison)
加入这个宏：#pragma clang diagnostic ignored"-Wlogical-not-parentheses"
16:(Auto property synthesis will not synthesize property 'superColor'; it will be implemented by its superclass, use @dynamic to acknowledge intention)
加入这个宏：#pragma clang diagnostic ignored"-Wobjc-property-synthesis"
17:('sizeWithFont:forWidth:lineBreakMode:' is deprecated: first deprecated in iOS 7.0 - Use -boundingRectWithSize:options:attributes:context:)
加入这个宏：#pragma clang diagnostic ignored "-Wdeprecated-declarations"
18:(Unsequenced modification and access to 't')
加入这个宏：#pragma clang diagnostic ignored "-Wunsequenced"
19:(Implicit conversion loses integer precision: 'long' to 'int')
加入这个宏：#pragma clang diagnostic ignored"-Wshorten-64-to-32"
20:(Add explicit braces to avoid dangling else)
加入这个宏：#pragma clang diagnostic ignored"-Wdangling-else"
21:(Unused function 'free_linkedlist')
加入这个宏：#pragma clang diagnostic ignored"-Wunused-function"
附上一个查找警告和宏关系的链接：http://fuckingclangwarnings.com